Stop motion control



Aug. 27, 1940. a MCRAE STOP MOTION CONTROL Original Filed July 19, 1938 2 Sheets-Sheet l A ttorneys .Aug. 27, 1940.

G. H. MCRAE 2,212,785

STOP MOTION CONTROL I Original Filed July 19, 1,938 2 Sheets-Sheet 2 I ,fiz j nl If?? A! if A; Z-

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A ttomeys In uentor Patented Aug. 27, 1940 UNlTED STATES STOP MOTION CONTROL George H. McRae, Thomaston, Ga., assignor of one-half to J. W. Ansley, Thomaston, Ga.

Application July 19,

1938, Serial No. 220,105

Renewed April 25, 1940 2 Claims.

My invention relates to improvements in looms and more particularly in stop motion controls therefor. g

The'principal object of my inventionis to a equip a loom embodying an electric stop motion,

with inexpensive quick-acting means for renderingthe stop motion effective under control of the filling fork in the event of filling failure.

My invention also comprehends other and subordinate objects all of which together with the exact nature of my improvements will be readily understood when the succeeding description and claims are read with reference to the drawings accompanying and forming part of this specification.

In said drawings:

Figure 1 is a view partly in side elevation and partly in transverse section illustrating the application of my invention,

Figure 2 is a view in top plan of the filling detection fork slides, the filling detection fork, the weft hammer head, and the slide member, together with parts associated with said hammer,

Figure 3 is a view in perspective of the filling detection fork,

Figure 4 is a view in longitudinal section taken on the line 4-4 of Fig. 2 looking in the direction indicated by the arrows and drawn to an enlarged scale,

- Figure 5 is a view in transverse section taken on the line 55 of Fig. 4,

Figure 6 is a view in perspective of the slide member, and

Figure '7 is a view in perspective of a filling tensioning block presently described in detail.

In the drawings to which reference will now be had by numerals, I have illustrated only those parts of a loom essential to a clear understanding of the invention, to wit, the lay I rocked by the shaft 2, the usual filling detection fork slides 3 which are mounted as usual on the breast beam, not shown, the filling detection fork 4 pivoted, as at 5, on the rear end of the slides 3 to swing therebetween, and the filling, or weft, hammer, or vibrator, 6 pivotally mounted on the shaft 1 for oscillation by means of the cam 8, cam shaft 9 and follower In with its head II in the usual longitudinal slot l2 provided between the detection filling fork slides 3. The filling detection with a lateral rearwardly extending finger I4 intermediate its ends, and a looped end l5 extending forwardly from the upper end of said tine.

The loom parts identified in the foregoing are 5 well understood and need not be described in fork 4 has the usual depending tine l3 provided leased and said end l5 of the filling detectionfork 4 drops .by gravity down towards slides 3. It is usual in the art to utilize such dropping of the end I5 of the filling detection fork 4 to couple the same to the head ll of the filling hammer 6 so that upon the forward stroke. of said. hammer the detection filling fork slides 3 are moved forwardly to operate mechanism for stopping the loom.

The loom with which my invention is concerned is equipped with an electric stop motion of any of the usual types for instance that shown generally in my U. S. Patent No. 2,100,197, dated Nov. 23, 1937, and including a live electrode It, a grounded electrode I'I, and a normally open circuit including a lead l8 from the live electrode l6 and another lead from the electrode ll.

According to my invention, a slide member l9, generally cruciform in cross section, is suitably mounted on the detection filling fork slides 3 intermediate the same, for instance as shown in Fig. 5, in the rear of the head ll of the filling hammer 6 and pivotally connected at its front end, as at 2D, to said head for reciprocation by the latter in said guides. Intermediate its ends the slide member I9 has a vertical central bore 22 therein in which is fitted a bushing 23 of insulation material which in turn has fitted therein a sleeve'24 of conductive material extending slight- 1y below the bushing 23 and member [9 with a set screw '25 threaded diametrically in its lower end. The lead I8 which, as will be understood, extends from one side of the circuit is secured to the underside of the member l9 by a screw 26 and the lead l8 extending from the other side of the circuit is secured in the lower end of the sleeve 24 by set screws 25. The member I9 is of conductive material and has a shoulder 21 extending across the top thereof diametrically of the bushing 23 and sleeve 24, said member being of a Width such that the looped end l5 of the filling detection fork 4 will, when said fork drops, span the top of said member forwardly of said shoulder and ride upon said top forwardly of the shoulder thereof.

The head I l of the filling hammer 6 is equipped on one side thereof with a square upright block of rubber 28 adjustably mounted thereon to extend rearwardly thereof by means of a forked bracket 29 to which the block is secured by a bolt 30 and which is adjustably mounted on said head by means of a slot 3| therein and a bolt 32 extending through the slot into said head. The function of the block 28 is to meet the lay in the limit of the forward stroke of the latter and wedge the filling between the same and the lay to tension each filling thread uniformly so that said filling always raises the end l5 of the detection filling fork for a uniform distance clear of the member l9.

In the operation of the described control, as long as no filling failure occurs the detection filling fork 4 is held by the filling in a position such that the end 15 thereof is raised above the L slide member l9 and the circuit is open. Until the filling comes in from either side of the loom the looped end I5 rides on the top of said member l9 forwardly of the sleeve 24, that is when the'head H of hammer 6 is starting on its forward stroke. In the event of filling failure, on the forward stroke of said head H the member I 9 is moved forward until said end l5 of the filling detection fork :3 engages the upper end of the sleevez i in which position it is caught in front of the shoulder 27. At this point the sleeve 24 is bridged by saidend l5 to the member l9 and the circuit completed to the lead l8 thus closing said circuit and stopping the loom. As soon as filling is replenished said end I5 is raised thus opening the circuit whereupon the loom resumes operation.

The foregoing will, it is believed, sufiice to impart a clear understanding of my invention without further explanation.

Manifestly the invention, as described, is susceptible of modification without departing from the inventive concept and right is herein reserved to such modifications as fall within the scope of the subjoined claims.

What I claim is:

1. In a loom having an electrical stop motion including a normally open circuit, a filling hammer arranged to vibrate in opposite directions, means to vibrate said hammer, and a filling detection fork pivotally mounted for gravitational operation under filling failure, means to close said circuit rendered eifective under gravitational operation of said fork and operation of said hammer in one direction, andincluding a slide member reciprocated by said hammer toward and from said fork, a contact mounted in said member and insulated therefrom, and a loop on said fork adapted to descend on said member and bridge said contact thereto.

2. In a loom having an electrical stop motion including a normally open circuit, a filling hammer arranged to vibrate in opposite directions,

means to vibrate said hammer, and a filling detection fork pivotally mounted for gravitational operation under filling failure, means to close said circuit rendered effective under gravitational operation of said fork and operation of said hammer in one direction, and including a slide member reciprocated by said hammer toward and.

from said fork, a contact mounted in said member and insulated therefrom, and a loop on said fork adapted to descend on said member and bridge said contact thereto, and a shoulder on top of said member adapted to be engaged by said loop to establish the bridging. position of the loop relative to said contact.

- GEORGE H. MCRAE. 

